Results of search by OECD country
| Country | Studies including duplicates (n) | Studies excluding duplicates (n) | Included studies for full manuscript review (n) | Eligible for inclusion studies | Final included most recent studies |
| Australia and New Zealand | 174 | 152 | 6 | 4 | 1 |
| Austria | 16 | 13 | 1 | 0 | 0 |
| Belgium | 8 | 8 | 0 | 0 | 0 |
| Canada | 112 | 91 | 18 | 9 | 2 |
| Chile | 5 | 3 | 1 | 0 | 0 |
| Czech Republic | 4 | 3 | 1* | 0 | 0 |
| Denmark | 23 | 17 | 2 | 0 | 0 |
| Estonia | 1 | 1 | 0 | 0 | 0 |
| Finland | 10 | 7 | 2 | 1 | 1 |
| France | 47 | 36 | 5 | 0 | 0 |
| Germany | 103 | 96 | 7 | 2 | 1 |
| Greece | 8 | 6 | 0 | 0 | 0 |
| Hungary | 4 | 3 | 0 | 0 | 0 |
| Iceland | 2 | 2 | 0 | 0 | 0 |
| Ireland | 83 | 78 | 1 | 0 | 0 |
| Israel | 42 | 31 | 4 | 0 | 0 |
| Italy | 74 | 61 | 2 | 2 | 1 |
| Japan | 74 | 62 | 9 | 3 | 1 |
| Korea | 14 | 10 | 2 | 1 | 1 |
| Luxembourg | 0 | 0 | 0 | 0 | 0 |
| Mexico | 26 | 16 | 1 | 0 | 0 |
| Netherlands | 48 | 42 | 1 | 0 | 0 |
| Norway | 11 | 7 | 0 | 0 | 0 |
| Poland | 20 | 17 | 3 | 1 | 1 |
| Portugal | 3 | 2 | 0 | 0 | 0 |
| Slovak Republic | 0 | 0 | 0 | 0 | 0 |
| Slovenia | 2 | 2 | 0 | 0 | 0 |
| Spain | 38 | 31 | 3 | 1 | 1 |
| Sweden | 30 | 25 | 5 | 1 | 1 |
| Switzerland | 46 | 43 | 8 | 2 | 1 |
| Turkey | 53 | 42 | 0 | 0 | 0 |
| UK | 212 | 203 | 4 | 0 | 0 |
| USA | 588 | 516 | 34 | 6 | 2 |
| Grey literature | 7 | 7 | 0 | 0 | 0 |
| Total | 1888 | 1633 | 120 | 33 | 14 |
*Full manuscript unavailable.
OECD, Organisation for Economic Co-operation and Development.